Hi Carlos, for MoI v4 Max's CustomUI mod is installed in the Moi appdata startup folder.

To go there, in a file explorer address bar type in %AppData%\Moi\startup and push Enter.

Inside that folder there will be several .js files, move these out of the startup folder (you can put them into a child folder of startup if you want) and then it won't be active.

- Michael